Observations on aspects of skid-resistance of greywacke aggregate

The paper outlines recent investigations concerning the Polished Stone Valu e (PSV) test method. Although the research is limited to greywacke aggregat e from Northern Ireland the results indicate that the standard PSV test may not adequately predict the ultimate level of skid-resistance reached by th e aggregates assessed. Extending the duration of polishing further decrease s skid-resistance. Modifying the apparatus to simulate cornering situations using angled polishing produced significant reductions in skid-resistance. It was also shown that results may alter when the aggregate size is decrea sed. The paper concludes that further research is necessary in order to pre dict the in-service performance of aggregates in the laboratory.